2-(4-Hydroxybenzoyl)benzoic acid 3-10-00-04429 (Beilstein Handbook Reference) 85-57-4 AI3-22141 BENZOIC ACID, o-(p-HYDROXYBENZOYL)- BRN 2116114 Benzoic acid, 2-(4-hydroxybenzoyl)- (9CI) Benzoic acid, p-(p-hydroxybenzoyl)- EINECS 201-616-4 Hybenzoate NSC 122980 Phthalein acid o-(p-Hydroxybenzoyl)benzoic acid